You have two links that enter the same OSPF router with the same bandwidth. You want to prefer one route over the other yet allow the second as a backup route. Which command would you use to achieve this?

A. Router(config-router)#ip ospf priority 25
B. Router(config-if)#ip ospf route primary
C. Router(config-if)#ip ospf cost 25
D. Router(config-router)#passive interface gi 0/0

C. The command ip ospf cost 25 should be configured on the interface that will act as the backup route. This adjustment of cost will allow the router to prefer the other route first.